An SO(10) model with adjoint fermions for double seesaw neutrino masses

作者：Chakrabortty Joydeep; Goswami Srubabati^*; Raychaudhuri Amitava

来源：Physics Letters B, 2011, 698(4): 265-270.

DOI：10.1016/j.physletb.2011.03.016

• GUT
• Seesaw
• Neutrino masses

An SO(10) model where the 10(H) and 120(H) representations are used for generating fermion masses is quite predictive, though due to the absence of SU(2)(L.R) triplet/singlet fields it cannot give rise to neutrino masses through the usual type-I or type-II seesaw mechanisms. In this Letter, for neutrino masses, we propose an extension of such an SO(10) model by adding fermions in the adjoint representation (45(F)) and a symmetry breaking scalar (16) over bar (H). The (H) over bar (H) couples the adjoint fermions to the standard fermions in 16(F) and induces neutrino masses through the 'double seesaw' mechanism. In addition, we impose (i) a parity symmetry leading to hermitian Yukawa Matrices and (ii) a mu-tau flavor symmetry on the Yukawa matrices for 10, and (16) over bar (H) whereas for the 120H it is assumed to be antisymmetric. Thus we consider the model SO(10) circle times Z(2)((mu-tau)) circle times Z(2)(P). We discuss the conditions that the mass matrices must obey so that the model can reproduce the tri-bimaximal mixing pattern.

• 出版日期2011-4-18